Combustion study of reactivity-controlled compression ignition (RCCI) for the mixture of diesel fuel and ethanol in a rapid compression machine

Loaiza, Juan Carlos Valdez; Sánchez, Fernando Zegarra; Braga, Sergio Leal

doi:10.1007/s40430-015-0400-y

Cited by 13 publications

(8 citation statements)

References 13 publications

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“…It is equipped with a fuel pressure and injection (time and duration) control system, pressure sensor, spark plug and fuel injector, as well as a fuel common rail, high-pressure pump and fuel tank. In addition to the diesel and Otto tests that can be performed at RCM, some other direct double injection studies have been performed, only modifying the RCM head (8), and incorporating two injectors with their respective injection systems [27]. This shows the versatility of this equipment to be able to perform different tests for different fuels, without the need of using an engine.…”

Section: Rapid Compression Machine (Rcm)mentioning

confidence: 99%

“…One of the most serious problems to be overcome is the poor ignitability of alcohol under diesel engine conditions [5,[21][22][23][24][25][26]. This is generally attributed to the high enthalpy of vaporization of alcohols and a higher auto-ignition temperature when compared to diesel [27,28]. The cetane number of ethanol is approximately 8, which is not high enough for its use in a CI engine [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Sánchez

Martins

Braga

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The world recognizes that the main source of energy used in transportation is diesel fuel because it is more economical and is also more efficient. For this reason, various sectors of transport and fuel production are developing new technologies aiming at the replacement of traditional fossil fuels by other renewable sources. In the current market, it is possible to find systems that run on blends of diesel and other renewable fuels and test systems that run on mixtures of ethanol and some other substance to reduce auto-ignition. To be able to use ethanol in compression ignition (CI) engines where diesel fuel is typically used, the poor flammability of ethanol under compression ignition conditions is the major problem to be overcome. The techniques used in trials with CI engines to correct this problem are preheating the air in the intake manifold, increasing the compression ratio or the addition of an ignition improver for ethanol. In this study, different tests were carried out in a rapid compression machine using ignition improvers derived from polyethylene glycol. Tests were conducted for different instants for the start of injection of the mixtures and different compression ratios.

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Section: Rapid Compression Machine (Rcm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Sánchez

Martins

Braga

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…High octane fuels or low reactivity with resistance to spontaneous ignition are more favorable for RCCI, PCCI and PPC combustion. For this reason, most of the studies carried out on RCCI, PCCI and PPC engines are focused on natural gas [89,[123][124][125][126][127][128][129][130][131][132][133] and ethanol [134][135][136][137][138][139][140][141][142][143][144] as an alternative fuel.…”

Section: Alternative Fuels For New Ice Applicationsmentioning

confidence: 99%

Alternative Fuels for Internal Combustion Engines

İlhak¹,

Tangöz²,

Akansu³

et al. 2019

The Future of Internal Combustion Engines

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Researchers have studied on alternative fuels that can be used with gasoline and diesel fuels. Alternative fuels such as hydrogen, acetylene, natural gas, ethanol and biofuels also uses in internal combustion engines. Hydrogen in the gas phase is about 14 times lighter than the air. Moreover, it is the cleanest fuel in the world. On the other hand because of its high ignition limit (4-75%), low ignition energy, needs special design to use as pure hydrogen in internal combustion engines. It is proved that hydrogen improves the combustion, emissions and performance, when is added as 20% to fuels. Natural gas is generally consisting of methane (85-96%) and it can be used in both petrol and diesel engines. Ethanol can be used as pure fuel or mixed with different fuels in internal combustion engines. In this section, the effects of natural gas, hydrogen, natural gas + hydrogen (HCNG), ethanol, ethanol + gasoline, ethanol + hydrogen, acetylene, acetylene + gasoline mixtures on engine performance and emissions have been examined.

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“…That increase in temperature is due to the viscous heating of the flow trespassing the needle seat when the lift is small (see Figure 3a), and for longer times after start of injection diminishes, reaching temperature levels similar to the ones observed in the simulation with fixed needle position. Different fuel temperatures at the orifice exit would lead to different droplet size and evaporation rates during the injection event [3,22].…”

Section: Nozzle Flowmentioning

confidence: 99%

“…Fuel injection conditions such as injection pressure and velocity, even injected fuel temperature [3], greatly affect spray development, and so combustion efficiency. Nonetheless, the study of flow characteristics inside Diesel nozzles is tricky due to their small characteristic length and hard testing conditions (very high pressure and velocity) [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of needle movement nozzle flow coupled with spray for a diesel injector using an Eulerian spray atomization model

Payri

Martí-Aldaraví

Alarcón

2017

J Braz. Soc. Mech. Sci. Eng.

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Gimeno, J.; Marti-Aldaravi, P.; Alarcón-Herrera, MY. (2017). Numerical simulation of needle movement nozzle flow coupled with spray for a diesel injector using an Eulerian spray atomization model. Abstract The injector dynamics have a strong impact on spray behavior, therefore on combustion efficiency and pollutant emissions. Nozzle flow and spray coupled simulations are useful tools to analyze the effect of nozzle geometry, and they could be used also to study the effect of needle movement. In this work, three different approximations to the same needle lift law are employed in an Eulerian Spray Atomization (ESA) model. The main advantage of this model is that is able to simulate nozzle flow and spray seamlessly. Engine Combustion Network (ECN) Spray A conditions are simulated. Results show that the experimental needle lift law can be used without any fitting to a smoothed expression, but all details of the needle dynamics must be considered in order to properly predict mass flow rate and spray penetration. Additionally, it has been shown that needle dynamics has a strong impact on heating effects inside the nozzle.Keywords Multi-phase · CFD · needle dynamics · atomization · fuel injection · moving mesh Final author version, cite as: Payri, R., Gimeno, J., Mart-Aldarav, P. et al. "Numerical simulation of needle movement nozzle flow coupled with spray for a diesel injector using an Eulerian spray atomization model", J Braz.

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Combustion study of reactivity-controlled compression ignition (RCCI) for the mixture of diesel fuel and ethanol in a rapid compression machine

Abstract: results are presented for compression ratios of 16:1 and 20:1.

Cited by 13 publications

References 13 publications

Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Alternative Fuels for Internal Combustion Engines

Numerical simulation of needle movement nozzle flow coupled with spray for a diesel injector using an Eulerian spray atomization model

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